Patent classifications
A
HUMAN NECESSITIES
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A63
SPORTS; GAMES; AMUSEMENTS
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A63B
APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
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2220/00
Measuring of physical parameters relating to sporting activity
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A63B2220/80
Special sensors, transducers or devices therefor
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A63B2220/801
Contact switches
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